COWSEL

COWSEL, POP-1
Paradigm	Multi-paradigm: structured, reflective, procedural
Family	Lisp: POP
Designed by	Robin Popplestone, Rod Burstall
Developers	University of Leeds, Bradford Institute of Technology, University of Edinburgh
First appeared	1964; 60 years ago
Typing discipline	dynamic
Implementation language	assembly
Platform	Ferranti Pegasus, Stantec Zebra, Elliot 4120
License	Proprietary
Influenced by
	CPL, Lisp
Influenced
	POP-2

COWSEL (COntrolled Working SpacE Language) is a programming language designed between 1964 and 1966 by Robin Popplestone. It was based on an reverse Polish notation (RPN) form of the language Lisp, combined with some ideas from Combined Programming Language (CPL).

COWSEL was initially implemented on a Ferranti Pegasus computer at the University of Leeds and on a Stantec Zebra at the Bradford Institute of Technology. Later, Rod Burstall implemented it on an Elliot 4120 at the University of Edinburgh.

COWSEL was renamed POP-1 in 1966, during summer, and development continued under that name from then on.

Example code

function member
lambda x y
comment Is x a member of list y;
define      y atom then *0 end
            y hd x equal then *1 end
            y tl -> y repeat up

Reserved words (keywords) were also underlined in the original printouts. Popplestone performed syntax highlighting by using underscoring on a Friden Flexowriter.